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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2014-08-06 23:10:05 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-07 01:01:26 (GMT)
commit877d9f3b63ac2e5dbc51cbcdff156433f03b3a32 (patch)
tree02d4e482f9bfa758bb59383a0dac95dfdeda45c0 /include
parent5be20213e855550de2b32fde6fc116f74bab86a6 (diff)
downloadlinux-877d9f3b63ac2e5dbc51cbcdff156433f03b3a32.tar.xz
lib: bitmap: make nbits parameter of bitmap_weight unsigned
The compiler can generate slightly smaller and simpler code when it knows that "nbits" is non-negative. Since no-one passes a negative bit-count, this shouldn't affect the semantics. I didn't change the return type, since that might change the semantics of some expression containing a call to bitmap_weight(). Certainly an int is capable of holding the result. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/bitmap.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 87e88f7..64b0ebe 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -110,7 +110,7 @@ extern int __bitmap_intersects(const unsigned long *bitmap1,
const unsigned long *bitmap2, unsigned int nbits);
extern int __bitmap_subset(const unsigned long *bitmap1,
const unsigned long *bitmap2, unsigned int nbits);
-extern int __bitmap_weight(const unsigned long *bitmap, int bits);
+extern int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
extern void bitmap_set(unsigned long *map, int i, int len);
extern void bitmap_clear(unsigned long *map, int start, int nr);
@@ -273,7 +273,7 @@ static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
return __bitmap_full(src, nbits);
}
-static inline int bitmap_weight(const unsigned long *src, int nbits)
+static inline int bitmap_weight(const unsigned long *src, unsigned int nbits)
{
if (small_const_nbits(nbits))
return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));